224 log_trace(redefine, class, obsolete, metadata)("calling check_class");
225 CheckClass check_class(thread);
226 ClassLoaderDataGraph::classes_do(&check_class);
227 #ifdef PRODUCT
228 }
229 #endif
230 }
231
232 void VM_RedefineClasses::doit_epilogue() {
233 unlock_classes();
234
235 // Free os::malloc allocated memory.
236 os::free(_scratch_classes);
237
238 // Reset the_class to null for error printing.
239 _the_class = NULL;
240
241 if (log_is_enabled(Info, redefine, class, timer)) {
242 // Used to have separate timers for "doit" and "all", but the timer
243 // overhead skewed the measurements.
244 jlong doit_time = _timer_rsc_phase1.milliseconds() +
245 _timer_rsc_phase2.milliseconds();
246 jlong all_time = _timer_vm_op_prologue.milliseconds() + doit_time;
247
248 log_info(redefine, class, timer)
249 ("vm_op: all=" UINT64_FORMAT " prologue=" UINT64_FORMAT " doit=" UINT64_FORMAT,
250 all_time, _timer_vm_op_prologue.milliseconds(), doit_time);
251 log_info(redefine, class, timer)
252 ("redefine_single_class: phase1=" UINT64_FORMAT " phase2=" UINT64_FORMAT,
253 _timer_rsc_phase1.milliseconds(), _timer_rsc_phase2.milliseconds());
254 }
255 }
256
257 bool VM_RedefineClasses::is_modifiable_class(oop klass_mirror) {
258 // classes for primitives cannot be redefined
259 if (java_lang_Class::is_primitive(klass_mirror)) {
260 return false;
261 }
262 Klass* k = java_lang_Class::as_Klass(klass_mirror);
263 // classes for arrays cannot be redefined
264 if (k == NULL || !k->is_instance_klass()) {
265 return false;
266 }
267
268 // Cannot redefine or retransform an anonymous class.
269 if (InstanceKlass::cast(k)->is_anonymous()) {
270 return false;
271 }
272 return true;
273 }
1808 case Bytecodes::_new : // fall through
1809 case Bytecodes::_putfield : // fall through
1810 case Bytecodes::_putstatic :
1811 {
1812 address p = bcp + 1;
1813 int cp_index = Bytes::get_Java_u2(p);
1814 int new_index = find_new_index(cp_index);
1815 if (new_index != 0) {
1816 // the original index is mapped so update w/ new value
1817 log_trace(redefine, class, constantpool)
1818 ("%s@" INTPTR_FORMAT " old=%d, new=%d", Bytecodes::name(c),p2i(bcp), cp_index, new_index);
1819 // Rewriter::rewrite_method() uses put_native_u2() in this
1820 // situation because it is reusing the constant pool index
1821 // location for a native index into the ConstantPoolCache.
1822 // Since we are updating the constant pool index prior to
1823 // verification and ConstantPoolCache initialization, we
1824 // need to keep the new index in Java byte order.
1825 Bytes::put_Java_u2(p, new_index);
1826 }
1827 } break;
1828 }
1829 } // end for each bytecode
1830
1831 // We also need to rewrite the parameter name indexes, if there is
1832 // method parameter data present
1833 if(method->has_method_parameters()) {
1834 const int len = method->method_parameters_length();
1835 MethodParametersElement* elem = method->method_parameters_start();
1836
1837 for (int i = 0; i < len; i++) {
1838 const u2 cp_index = elem[i].name_cp_index;
1839 const u2 new_cp_index = find_new_index(cp_index);
1840 if (new_cp_index != 0) {
1841 elem[i].name_cp_index = new_cp_index;
1842 }
1843 }
1844 }
1845 } // end rewrite_cp_refs_in_method()
1846
1847
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224 log_trace(redefine, class, obsolete, metadata)("calling check_class");
225 CheckClass check_class(thread);
226 ClassLoaderDataGraph::classes_do(&check_class);
227 #ifdef PRODUCT
228 }
229 #endif
230 }
231
232 void VM_RedefineClasses::doit_epilogue() {
233 unlock_classes();
234
235 // Free os::malloc allocated memory.
236 os::free(_scratch_classes);
237
238 // Reset the_class to null for error printing.
239 _the_class = NULL;
240
241 if (log_is_enabled(Info, redefine, class, timer)) {
242 // Used to have separate timers for "doit" and "all", but the timer
243 // overhead skewed the measurements.
244 julong doit_time = _timer_rsc_phase1.milliseconds() +
245 _timer_rsc_phase2.milliseconds();
246 julong all_time = _timer_vm_op_prologue.milliseconds() + doit_time;
247
248 log_info(redefine, class, timer)
249 ("vm_op: all=" JULONG_FORMAT " prologue=" JULONG_FORMAT " doit=" JULONG_FORMAT,
250 all_time, (julong)_timer_vm_op_prologue.milliseconds(), doit_time);
251 log_info(redefine, class, timer)
252 ("redefine_single_class: phase1=" JULONG_FORMAT " phase2=" JULONG_FORMAT,
253 (julong)_timer_rsc_phase1.milliseconds(), (julong)_timer_rsc_phase2.milliseconds());
254 }
255 }
256
257 bool VM_RedefineClasses::is_modifiable_class(oop klass_mirror) {
258 // classes for primitives cannot be redefined
259 if (java_lang_Class::is_primitive(klass_mirror)) {
260 return false;
261 }
262 Klass* k = java_lang_Class::as_Klass(klass_mirror);
263 // classes for arrays cannot be redefined
264 if (k == NULL || !k->is_instance_klass()) {
265 return false;
266 }
267
268 // Cannot redefine or retransform an anonymous class.
269 if (InstanceKlass::cast(k)->is_anonymous()) {
270 return false;
271 }
272 return true;
273 }
1808 case Bytecodes::_new : // fall through
1809 case Bytecodes::_putfield : // fall through
1810 case Bytecodes::_putstatic :
1811 {
1812 address p = bcp + 1;
1813 int cp_index = Bytes::get_Java_u2(p);
1814 int new_index = find_new_index(cp_index);
1815 if (new_index != 0) {
1816 // the original index is mapped so update w/ new value
1817 log_trace(redefine, class, constantpool)
1818 ("%s@" INTPTR_FORMAT " old=%d, new=%d", Bytecodes::name(c),p2i(bcp), cp_index, new_index);
1819 // Rewriter::rewrite_method() uses put_native_u2() in this
1820 // situation because it is reusing the constant pool index
1821 // location for a native index into the ConstantPoolCache.
1822 // Since we are updating the constant pool index prior to
1823 // verification and ConstantPoolCache initialization, we
1824 // need to keep the new index in Java byte order.
1825 Bytes::put_Java_u2(p, new_index);
1826 }
1827 } break;
1828 default:
1829 break;
1830 }
1831 } // end for each bytecode
1832
1833 // We also need to rewrite the parameter name indexes, if there is
1834 // method parameter data present
1835 if(method->has_method_parameters()) {
1836 const int len = method->method_parameters_length();
1837 MethodParametersElement* elem = method->method_parameters_start();
1838
1839 for (int i = 0; i < len; i++) {
1840 const u2 cp_index = elem[i].name_cp_index;
1841 const u2 new_cp_index = find_new_index(cp_index);
1842 if (new_cp_index != 0) {
1843 elem[i].name_cp_index = new_cp_index;
1844 }
1845 }
1846 }
1847 } // end rewrite_cp_refs_in_method()
1848
1849
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